| CPC A61B 5/0031 (2013.01) [A61B 1/041 (2013.01); A61B 5/02055 (2013.01); A61B 5/076 (2013.01); A61B 5/4528 (2013.01); A61B 5/4851 (2013.01); G16H 20/30 (2018.01); G16H 40/67 (2018.01); G16H 50/30 (2018.01); A61B 5/0013 (2013.01); A61B 5/024 (2013.01); A61B 5/1071 (2013.01); A61B 5/1118 (2013.01); A61B 5/112 (2013.01); A61B 5/1121 (2013.01); A61B 5/4585 (2013.01); A61B 5/6833 (2013.01); A61B 5/743 (2013.01); A61B 2090/309 (2016.02); A61B 2505/09 (2013.01); A61B 2560/0214 (2013.01); A61B 2562/0219 (2013.01); A61B 2562/0223 (2013.01); A61B 2562/0247 (2013.01)] | 20 Claims |

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1. A system for monitoring a patient, the system comprising:
at least one sensor unit, each of the at least one sensor unit configured for disposition on or within the patient proximate to a joint of the patient, each of the at least one sensor unit comprising a housing; a power source disposed within the housing; at least one accelerometer disposed within the housing and coupled to the power source; and a communication arrangement disposed within the housing, coupled to the power source and the at least one accelerometer, and configured for communicating accelerometer measurements from the at least one accelerometer, wherein the at least one sensor unit collectively comprises a plurality of the accelerometers;
a patient device configured and arranged for communication with each of the at least one sensor unit via the communication arrangement, the patient device comprising a display a memory, and a processor coupled to the display and memory, the memory having instructions stored thereon, wherein the processor executes the instruction to perform actions, the actions comprising:
a) receiving a range of motion goal;
b) receiving, via the communication arrangement of each of the at least one sensor unit, the acceleration measurements from at least two of the accelerometers of the at least one sensor unit as the joint is flexed and extended;
c) determining a range of motion of the joint using the acceleration measurements;
d) determining a center of rotation around the joint;
e) repeating at least steps b) and c) at least one time; and
f) displaying, on the display, a chart tracking progress in the range of motion over time and an indication of what portion of the range of motion goal has been met.
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